Oscillatory flow in the vicinity of pinned-contact capillary surfaces

Olles, Joseph D.
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Hirsa, Amir H.
Peles, Yoav
Zhang, Lucy T.
Steen, Paul H.
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Mechanical engineering
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This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
A one-dimensional computational model is shown to predict the dynamics of the double-droplet system well for a certain range of physical parameters. The double-droplet system in an all liquid environment was demonstrated by using an oil-based ferrofluid immersed in water, actuated by an oscillating magnetic field. The shape of the ferrofluid droplet interface under a magnetic field was shown to have a prolate shape, similar to shapes observed in electric fields. While actuating an immersed ferrofluid double-droplet system a new technique for extracting interfacial tension was developed through experiments and simulations. To understand the fluid flow at different frequencies and amplitudes throughout a period of oscillation, PIV was performed in an all-liquid system. Velocity profiles are presented at cross-sections, with variations dependent on the distance from the pinned-contact capillary surface. The velocity profiles tended to resemble an analytic solution for laminar fluid flow in an infinitely long pipe, where there is a lag in velocity between the centerline and near the wall as the frequency was increased.
May 2013
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
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